Adjustable gas-check.



No. 725,089. PATENT-ED APR. 14, 1903.

' J. F. W. JOST.

ADJUSTABLE GAS CHECK.

APPLICATION FILED MAR. 20. 1901. RENEWED SEPT. 17' 1902 N0 MODEL mowNITED- a'rnwr trier,

JOHN FREDERICK W. J 0ST, PHILADELPHIA, PENNSYLVANIA.

ADJUSTABLE ans er-inert.

SPECIFICATION forming part of Letters Patent N 0. 725,089, dated April14:, 1903.

Application filed March 20. 1901. Renewed September 17, 1902. SerialNo.123,722. (No model.)

To (all whom, it may concern.-

Be it known that 1, JOHN FREDERICK W. JOST, a citizen of the UnitedStates, residing at Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented a certain new and useful AdjustableGas-Oheck for Welsbach and other Incandescent Lights, of which thefollowing is a specification.

One object of the present invention is to provide an adjustablegas-check well suited for use in connection with lights that aresupplied with gas at comparatively low pressures.

Another object of the invention is to provide a comparativelyinexpensive, reliable, and satisfactory adjustable gas-check.

Other objects of the invention will be more fully understood from thefollowing description, and the invention itself will be hereinafterclaimed.

The nature, characteristic features, and scope of the invention will bemore fully understood from the following description,taken in connectionwith the accompanying drawings, forming part hereof, and in which-Figures 1, 2, and 3 are respectively a side elevation, a centralsection, and a plan of an adjustable gas-check embodying features of theinvention; and Fig. 4 is an elevational view showing the gas-check inapplication to aBunse'n tube, such as is used in connection with aVVelsbach or other incandescent light.

The members of the gas-check are connected together so as to berevoluble in respect to each other and in respect to their common axis.These members are at their edges fitted together so as to preventleakagefor example, by being flanged one inrespect to the other. Theyare also each fitted with a single opening, and the openings arearranged so as to lie in alinement with each other when the members arein one position" and to lie crosswise of each other at variousinclinations in respect to each other when the members are shifted.

In the drawings, 1 and 2 are the members of the gas-check. They areshown as dished or cuppedand fitted the one within the other.

3 indicates the flange portion, which islocated, generally speaking,near the edges or rims of the members and which serves to prevent theundesirable passage of gas.

4: and 5 are openings respectively formed in the caps or members 1 and2. These openings are arranged symmetrically in respect to the axis ofrevolution of the caps.

6 is a handle connected with or made part of one of the members.

In use the described gas -checl: may be placed between the sections 7and 8 of a Bunsen tube. These sections 7 and 8 may be properly threadedso as to be screwed togeiher, and the check may be held to place betweenthe lower edge of the section '7 and an internal flange on the section8.. The handle 6 may be arranged to project through one of theair-inlets 9, and one of the arms 10 may beslightly cut away, as shown,to accommodate the desired movement of the handle 6. When the handle 6is turned into one of its extreme positions, the openings 4 and 5 are inalinement, and therefore the passage for gas corresponds with theirarea. In the other extreme position the passages 4: and 5 are arrangedsubstantially crosswise of each other,

and therefore the area for the passage of gas is materially reduced, aswill be understood by reference, for example, to Fig. 3. The area of thepassage for gas may be varied that is, made larger or smallerwithinthese limits by shifting the handle 6 as desired. In the constructionshown in the drawings the axis of rotationcorrespouds with the center offigure of the openings t and 5, so that in all positions of themembers land 2 the cen ter of the opening through which the gas passes remainsthe same, although the size of the opening is varied, as has beendescribed.

' It will be obvious to those skilled in the art to which the inventionrelates that modifications may be made in details without departing fromthe spirit thereof. Hence I do not limit myself to the preciseconstruction and arrangement of parts hereiuabove set forth, andillustrated in the accompanying drawings; but,

Having thus described the nature and objects of the invention, what Iclaim as new, and desire to secure by Letters Patent, is-

-1. An adjustable gas-check consisting of two members revoluble inrespect to each other and each provided with a single oblong opening,said openings arranged symmetrically in respect to the axis ofrevolution of the members and having their centers of figure saidmembers engaging the other of said members, and an oblong opening ineach of said members arranged symmetrically in respect to its axis ofrevolution, substantially as [5 described.

In testimony whereof I have hereunto signed my name.

. JOHN FREDERICK W. JOST. In presence of W. J. JACKSON, A. B. STOUGHTON.

